![]() OK, it died again with the o2 sensor still installed but unhooked from the electrical connector. Then, I will at least know if the problem is exhaust related or if it is something else. I believe that if it will run like that, without dying on me after 20 minutes, that would indicate that my catalytic converter is not clogged up. My new plan is to keep the sensor installed in the manifold, but unplugged from the electrical connector. I believe that my problem is either a clogged catalytic converter or I suspect that the computer is incorrectly adjusting things which makes the truck die when it goes to closed loop. Remember that I have no check engine codes on the dash, except of course when I unplugged the o2 sensor. When the truck dies, I know that the injectors are still squirting gas, and I still have spark at each wire. The truck died again after running for 20 minutes. Today I installed the new o2 sensor in the manifold and plugged it into the electrical connector and started it. With the o2 sensor unplugged from the electrical connector and unscrewed from the exhaust manifold, the truck ran over 20 minutes without dying. Pretty bad gas mileage, I know it is a V8, but it is just as thirsty when I am not carrying anything as when I am pulling a carĪ couple months ago, after driving for about 30 minutes or so, the engine would make a "Pfft" noise and would start popping and I would have to drive with 2 feet to keep the engine running. Here are some of the other symptoms I have been noticing over the last couple months: Ignition Coil - changed last month because of poppingįuel Filter - changed last Thursday, thinking it was a fuel problem Ignition control module- I changed today, I really thought that would fix the problem after speaking with the Autozone guy - lifetime warranty Plug wires - changed all in November, since I noticed one of the old ones was tore - lifetime warrantyĭistributor cap and rotor - changed last month when the engine started popping - autozone Spark plugs - no more engine popping or driving with 2 feet - changed last week on Tuesday - AC Delco CR43TS gapped at. Starter - burnt it out when it first died 2 weeks ago, now I know not to crank when below 9 volts - lifetime warranty Things I have changed so far (mostly from Autozone): Today, I first drove it at 8pm, and the problem happened. On Saturday, I didn't leave my house until 2pm and the problem happened. Last week, it happened to me in the mornings. It is not just a "morning problem", but a "first time I have started the truck that day" kind of problem. I'll go home and go to sleep, and sometime the next day I'll go to my truck, and it will start back up, and I'll drive back home, and I'll make it as long as it takes less than 20 minutes. When someone shows up to give me a jump after the battery gets low, it will not start. I'll turn the key and the engine will rotate, but will not start. I have sat in the car for literally 4 hours patiently waiting for it to start. After driving for about 20 minutes, the engine will die while driving, and will not start back up until the next day. ![]() I'll start the car up and it runs just fine, no problems. This problem has been going on for 2 weeks. Supposedly a different 350 engine and transmission was put in a couple years ago. It is a 1991 C1500 2wd, ext cab, short bed 5.7L engine with about 300k miles on it that I have had for a year. I am sick of my truck leaving me stranded.
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